Water-cooled grate



Patented Feb. 8, 192.7. 7

UNITED," sTArEs PATEN-TQFFICBD JULIUS BRAUNSTEIN, F BRONX,- NEWYORK,ASSIGNOR 'ro PREMIER COAL SAVING DEVICE CORPORATION, A o nrOnArroN orNEW YORK.

WATERFOOOLED; GBATE.

Application filed May 22,

This invention relates to improvements in water cooled grates. asusedin. connection with coal burnin and like furnaces and has as one of.its objectsto provide a series of hollow gratebars arranged closelyadjacent as tovbe rigidly held together "and. mutually support oneanother,theinterengaging eleg ments being water tight so that no leakingcan occur.

These and other advantageous objects, such as simplicity, cheapness ofconstruction and ease of assemblage, are accomplished by the novelconstruction, combination and arrangementof parts hereafter describedand shown in the accompanying drawing, forming a material part of thisdisclosure, and in which Figure 1 is a perspective view of an embodimentof the invention looking from one of the rear corners, parts beingbroken away to show the construction.

Figure 2 is a fragmentary bottom plan view of a portion of the grate asassembled, drawn to an increased scale.

Figure 3'is a partial sectional view, taken on line 3-3 of Figure 2 anddrawn to a further enlarged scale.

Figure 4 is a similar view taken on line 44 of Figure 2.

In the drawing the numeral 10 designates in general a hollow rectangularbox-like chamber having a floororbottom 11, end walls 12 and side walls13, all of which extend to a uniform height; and in one of the sidewalls is some form of'a door or closure (not shown) through which theinterioris accessible, as for cleaning or other purposes. v I

I The outermost grate bars 14 at the front and rear are of diflerentpatterns.

Each of these bars, as shown, consists of a hollow rectangular bodyclosed upon all sides and ends presenting a water space 15 throughoutits full length, the same being disposed transversely of the fire boxdirectly upon'the end walls 12 of the chamber 10.

The upper wall of these box-like bars is extended on adjacent sides,level with the 1923. serial my. 640,747.

outer surface as at 16, these flanges be1ng offset downwardly, at .theiredges forming ledges 17, the extensions being strengthened by integralangular braces 18, the length of. theledges bemgless thanthatofth ebars,

stopping uniformly short at each end.

Below. theflanged extensions 16, at eachv end,,fon,adjacent sides ofboth of the extreme grate bars are relatively short and, generallycircular projecting bosses 19, the purpose of which willbelaterdescribed. The intermediate grate bars 20 are formed induplicate, each being of thesame depth as the bars 14, .but relativelynarrow, as can befbestseen in Figure 3. Their four walls and endsconstitute water l chambers 21v and theirgupper walls are extended, asat 22 having braces23 an dprovided with ledges 24Lcorresponding to theextensions 16 and ledges 17 as described;

On the opposite side of the intermediate bars are flanges 25 havingbraces 26, these extensions being suited to seat on the ledges .17 or 24with which they may be assembled.

At each end of the bars 20, below the flange extensions 22 are bosses 27correspondingto the bosses 19 and on the opposite sides of the bars areother bosses 28, all of these several projecting bosses at one endof-the grate being in register and containing conical openings 29 and 30respectively.

These openings are. smooth finished to receive push nipples havingopposed tapers 31 and 32 fitting tightly and'containing central bores 33through which water may flow from one grate bar to another, the waterentering one of the outer bars 14 by the supply pipe 34, passing throughthe series of bars and out eventually through the pipe 35.

These several grate bars are firmly held together by rods 36 passingthrough the projection or bifurcated ears 37 on the end bars 14, thenuts 37 drawing the nipples into the conical openings in such manner asto make water-tight joints.

All of the several extending flanges 16, 22 and 25 contain a pluralityof openings 38, preferably tapering their bases or larger ends beingdirected downwardly and open to the chamber 10, into which leads a pipewith a supply of air un- I 39 communicating der pressure.

In operation, the grate having been in-, stalled in a furnace, toconstitute the bottom of its fire box, preferably With the barsextending cross-Wise, the fuel may be en tered and fire started.

An air blast, supplied by the pipe 39 provides for any required .draftand may bev controlled in any convenient manner, the air passing outthrough the perforations 38.

Water under head or pressure entering the pipe 34 is conducted throughthe series of grate bars, carrying off excessive heatin an obviousmanner, the heated Water leaving" by the pipe-85 for any desireddestination. From the foregoing it will be seen that the grate barsrequire but three patterns from Which plain castings can be made and 7that the doubly tapered plugs or push nipset forth the manner of itsconstruction and use, What I claim as new and desire to secure byLetters Patent is A grate comprising a series of hollovv substantiallyrectangular bars constituting Water chambers, laterally extendingflanges formed on the respective sides of each bar and extendinglongitudinally thereof, the

upper surfaces of said flanges being flush With the upper surfaces ofsaid bars, a dependingledge formedon the outer'longt tudinaledgeofone ofsaid flanges on one side of eachbar for receiving the outer longitudinaledge portion of the fiange formed on the opposed side of the adjacentbar, whereby the adj acent longitudinal edges of the adjacentflanges-are arranged in abutting relat1on,-brac1ng means for saidflanges, I means for communlcating the several hollow bars to permit thecirculationfof Watertherethrough,'and meansfor clamping the barstogether in assembled relation.

Signed" at NeW York inthe county of New York and State of New York this12th day of May A.-D.-1923.

JULIUS BRAUNSTEI-N.

